A low pressure system that brought brief periods of light rain to San Diego County Sunday will produce sporadic and widely scattered drizzle across the region through early Monday, says the National Weather Service.

The drizzle will be persistent enough to slicken some roadways during Monday's early morning rush hour. Motorists using the eastern leg of Interstate 8 also may encounter patches of dense fog through Monday morning.

The drab skies arise from a seasonal shift in the weather. Low pressure systems are dropping down the California coast and getting pushed inland by the wind. The flow pattern brought lots of fog to such inland areas as Julian, which also had light rain Sunday.

The system now passing through isn't strong; forecasters say that the center of the cold front probably won't make it into the San Diego area on Monday. But the system has had a moderating influence during a month when it has been unusually warm. The average monthly temperature is running at 70.8 degrees at Lindbergh Field, or 3.4 degrees above normal. The average at Ramona has been 66.8, or 2.2 degrees above normal.

Sample of Sunday's rainfall:

Montgomery Field: 0.22''

Solana Beach: 0.20''

Encinitas: 0.20''

SeaWorld: 0.19''

Chula Vista: 0.18''

Del Mar: 0.15''

Brown Field: 0.15''

San Diego Lindbergh Field: 0.15''

Oceanside Airport: 0.11''

Carlsbad Airport: 0.10''

Rancho San Diego: 0.10''

Rancho Bernardo: 0.09'

Poway: 0.09''

Escondido: 0.08''

Ramona Airport: 0.08''

El Cajon: 0.08''

Vista: 0.07''

Fallbrook: 0.07''

La Mesa: 0.07''

Imperial Beach: 0.06''

San Pasqual Valley: 0.06''

Santee: 0.06''

Julian: 0.05''

Alpine: 0.04''

More precipitation is badly needed. Since Jan. 1, Lindbergh has received 4.02'' of rain, which is 3.53'' below normal.